anterior commissure(redirected from commissura anterior)
Also found in: Encyclopedia.
1. a site of union of corresponding parts, such as the angle of the lips or eyelids.
2. the site of junction between adjacent cusps of a cardiac valve.
anterior commissure the band of fibers connecting the parts of the two cerebral hemispheres.
commissure of epithalamus a large fiber bundle that crosses the midline of the epithalamus just dorsal to the point where the cerebral aqueduct opens into the third ventricle.
middle commissure a band of gray matter joining the optic thalami; it develops as a secondary adhesion and may be absent.
posterior commissure commissure of epithalamus.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
a round bundle of nerve fibers that crosses the midline of the brain near the anterior limit of the third ventricle. It consists of a smaller anterior part (pars anterior commissurae anterioris [TA]), the fibers of which pass in part to the olfactory bulbs, and a larger posterior part (pars posterior commissurae anterioris [TA]), which interconnects the left and right temporal lobes.
Synonym(s): commissura anterior [TA]
Farlex Partner Medical Dictionary © Farlex 2012
anterior commissureThe anterior ligamentous attachment of the true vocal cords to the thyroid cartilage, which, because it lacks an internal perichondrium, is a common site of extension of squamous cell carcinomas from the anterior commissure.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
an·te·ri·or com·mis·sure(an-tēr'ē-ŏr kŏm'i-shŭr) [TA]
A round bundle of nerve fibers that crosses the midline of the brain near the anterior limit of the third ventricle. It consists of a smaller anterior part, the fibers of which pass in part to the olfactory bulbs, and a larger posterior part, which interconnects the left and right temporal lobes.
[L. commissura anterior]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
anterior commissureA nerve fibre bundle running across the midline of the brain from one hemisphere to the other, just in front of the THIRD VENTRICLE.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005